| 1 | #define _GNU_SOURCE 1
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| 2 | #include <string.h>
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| 3 |
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| 4 | #ifdef _MSC_VER
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| 5 | _inline void *
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| 6 | #else
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| 7 | static __inline__ void *
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| 8 | #endif
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| 9 | my_inline_memchr(const void *pv, int ch, register size_t cb)
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| 10 | {
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| 11 | register const unsigned int uch = (unsigned)ch;
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| 12 | register const unsigned char *pb = (const unsigned char *)pv;
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| 13 | #if 0 /* 8-byte loop unroll */
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| 14 | while (cb >= 8)
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| 15 | {
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| 16 | if (*pb == uch)
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| 17 | return (unsigned char *)pb;
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| 18 | if (pb[1] == uch)
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| 19 | return (unsigned char *)pb + 1;
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| 20 | if (pb[2] == uch)
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| 21 | return (unsigned char *)pb + 2;
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| 22 | if (pb[3] == uch)
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| 23 | return (unsigned char *)pb + 3;
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| 24 | if (pb[4] == uch)
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| 25 | return (unsigned char *)pb + 4;
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| 26 | if (pb[5] == uch)
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| 27 | return (unsigned char *)pb + 5;
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| 28 | if (pb[6] == uch)
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| 29 | return (unsigned char *)pb + 6;
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| 30 | if (pb[7] == uch)
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| 31 | return (unsigned char *)pb + 7;
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| 32 | cb -= 8;
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| 33 | pb += 8;
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| 34 | }
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| 35 | switch (cb & 7)
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| 36 | {
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| 37 | case 0:
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| 38 | break;
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| 39 | case 1:
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| 40 | if (*pb == uch)
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| 41 | return (unsigned char *)pb;
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| 42 | break;
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| 43 | case 2:
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| 44 | if (*pb == uch)
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| 45 | return (unsigned char *)pb;
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| 46 | if (pb[1] == uch)
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| 47 | return (unsigned char *)pb + 1;
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| 48 | break;
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| 49 | case 3:
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| 50 | if (*pb == uch)
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| 51 | return (unsigned char *)pb;
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| 52 | if (pb[1] == uch)
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| 53 | return (unsigned char *)pb + 1;
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| 54 | if (pb[2] == uch)
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| 55 | return (unsigned char *)pb + 2;
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| 56 | break;
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| 57 | case 4:
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| 58 | if (*pb == uch)
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| 59 | return (unsigned char *)pb;
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| 60 | if (pb[1] == uch)
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| 61 | return (unsigned char *)pb + 1;
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| 62 | if (pb[2] == uch)
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| 63 | return (unsigned char *)pb + 2;
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| 64 | if (pb[3] == uch)
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| 65 | return (unsigned char *)pb + 3;
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| 66 | break;
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| 67 | case 5:
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| 68 | if (*pb == uch)
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| 69 | return (unsigned char *)pb;
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| 70 | if (pb[1] == uch)
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| 71 | return (unsigned char *)pb + 1;
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| 72 | if (pb[2] == uch)
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| 73 | return (unsigned char *)pb + 2;
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| 74 | if (pb[3] == uch)
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| 75 | return (unsigned char *)pb + 3;
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| 76 | if (pb[4] == uch)
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| 77 | return (unsigned char *)pb + 4;
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| 78 | break;
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| 79 | case 6:
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| 80 | if (*pb == uch)
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| 81 | return (unsigned char *)pb;
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| 82 | if (pb[1] == uch)
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| 83 | return (unsigned char *)pb + 1;
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| 84 | if (pb[2] == uch)
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| 85 | return (unsigned char *)pb + 2;
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| 86 | if (pb[3] == uch)
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| 87 | return (unsigned char *)pb + 3;
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| 88 | if (pb[4] == uch)
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| 89 | return (unsigned char *)pb + 4;
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| 90 | if (pb[5] == uch)
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| 91 | return (unsigned char *)pb + 5;
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| 92 | break;
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| 93 | case 7:
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| 94 | if (*pb == uch)
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| 95 | return (unsigned char *)pb;
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| 96 | if (pb[1] == uch)
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| 97 | return (unsigned char *)pb + 1;
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| 98 | if (pb[2] == uch)
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| 99 | return (unsigned char *)pb + 2;
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| 100 | if (pb[3] == uch)
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| 101 | return (unsigned char *)pb + 3;
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| 102 | if (pb[4] == uch)
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| 103 | return (unsigned char *)pb + 4;
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| 104 | if (pb[5] == uch)
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| 105 | return (unsigned char *)pb + 5;
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| 106 | if (pb[6] == uch)
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| 107 | return (unsigned char *)pb + 6;
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| 108 | break;
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| 109 | }
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| 110 |
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| 111 | #elif 1 /* 4 byte loop unroll */
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| 112 | while (cb >= 4)
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| 113 | {
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| 114 | if (*pb == uch)
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| 115 | return (unsigned char *)pb;
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| 116 | if (pb[1] == uch)
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| 117 | return (unsigned char *)pb + 1;
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| 118 | if (pb[2] == uch)
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| 119 | return (unsigned char *)pb + 2;
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| 120 | if (pb[3] == uch)
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| 121 | return (unsigned char *)pb + 3;
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| 122 | cb -= 4;
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| 123 | pb += 4;
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| 124 | }
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| 125 | switch (cb & 3)
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| 126 | {
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| 127 | case 0:
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| 128 | break;
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| 129 | case 1:
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| 130 | if (*pb == uch)
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| 131 | return (unsigned char *)pb;
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| 132 | break;
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| 133 | case 2:
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| 134 | if (*pb == uch)
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| 135 | return (unsigned char *)pb;
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| 136 | if (pb[1] == uch)
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| 137 | return (unsigned char *)pb + 1;
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| 138 | break;
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| 139 | case 3:
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| 140 | if (*pb == uch)
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| 141 | return (unsigned char *)pb;
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| 142 | if (pb[1] == uch)
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| 143 | return (unsigned char *)pb + 1;
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| 144 | if (pb[2] == uch)
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| 145 | return (unsigned char *)pb + 2;
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| 146 | break;
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| 147 | }
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| 148 |
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| 149 | #else /* the basic loop */
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| 150 | while (cb > 0)
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| 151 | {
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| 152 | if (*pb == uch)
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| 153 | return (void *)pb;
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| 154 | cb--;
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| 155 | pb++;
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| 156 | }
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| 157 | #endif
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| 158 | return 0;
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| 159 | }
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| 160 |
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| 161 | #define memchr my_inline_memchr
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| 162 |
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